package tt.love.hw;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class SecurityFilter implements Filter {

   
    public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain ) throws IOException,ServletException {
       
        HttpServletRequest req = (HttpServletRequest) request;
        UserSessionInfo usersession = (UserSessionInfo)req.getSession().getAttribute("USI");

        if(usersession!=null) {   
            chain.doFilter(request, response);        
        }
        else {
        	((HttpServletResponse)response).sendRedirect("/login.jsp");
        }
    }

	public void destroy() {
		
	}

	public void init(FilterConfig arg0) throws ServletException {

	}
   
}
